I haven't heard that. I know there are many people here who have gotten pets spayed and neutered through their local shelters and I haven't heard a complain like that. I would give it a try. She really needs to be spayed. She is too young for babies...with being so young it increases the chances of miscarriage, small weak kittens, birthing problems for momma, and others. Also each and every heat and pregnancy increases her chances of getting certain cancers. I would definately check out the shelters and ask about spay/neuter clinics.